American Pilot Punished

There are several sources reporting this but I have chosen CBC.ca as the source. The American pilot that killed four and injured eight Canadian soldiers in 2002 has been found guilty of direlection of duty. He has been allowed to remain in the Illinois National Gaurd, he can't fly again, it will cost him nearly 6,000 dollars. Likely he will leave the military without changing rank. He is said to have been "arrogant", "with no remorse toward the injury and pain he caused the Canadian forces". My question is, is the punishment enough? Should he have to do time (in prison) for diobeying direct orders? Let me know what you think you know how!